Gauge head for pneumatic gauges



Dec. 30, 1952 R. 5. FOX

GAUGE HEAD FOR PNEUMATIC GAUGES Filed May 25, 1949 I [AWE/V701? 1?. $.FOX

Patented Dec. 30, 1952 STAT PATENT OFFICE GAUGE HEAD FOR PNEUMATIC GAUGES Raymond S. Fox, West Hartline-d (1.0mm assignpi to. Niles-Bement-Pond Company, West Hor ford, Conn or corporation of New Jersey Application May 25, 1949, SeriaINo. 95,245

Claims 1.

Th s invention relates to precision dimensio eases... end'more Particularly to pheiimatioease shootout-el ngated boressuch es the bartels, of fire arms.

An object of importance of the ihventiohis to provide a precision; internal dimension gage adapted particularly for determining minute variations diameter of an elongated bore throughoutthe length or the; bore;

Another obiect. oi? the invention is to provide o-reduceci-oiosmg efieetof thewnozzleclosing member in its movements, toward and from the orifice oi theair nozzle compared to. its redial. movements, by en agement with the. suriaoe- 05 the: work piece heihg gaged.

Another obieet. of the invention, is to provide an adjustment-oi the work; engaging and nozzle closing member: to varythe opening between the end. face. of the nozzle and that of the work engaging and nozzle closingmember,, sothat the age may be adjusted for variable, diameters while. mail.iteihii'igv the same; gap or openin of the closing surface relative to the; nozzle crime.

And finally... it is an, object. of the invention to provide the endiface .ofithe member in which the nozzle orifice is provided at anoblique angle to. the axis of the bore being gaged and: to. P120- vijde, atoorrespondinglyobliquelydisposed. sill face on thenozzie closing and, work engaging member adjacent the nozzle end. face The-operation. oteir gases. in which the. dis: tonce. Qf: the. orifice of the. nozzle from thesur face of the work, piece. being. geged varies: more then a tow thousandths of. an inch, hashereitofore Plover; unsatisfactory; Air gages normal 11.11am been suocessiuliv used for gegi g Vaniatioos. in' diameter. of about hr 0 fouhthour sandthsr hut when reater'variations ar QnQQUIb tered; complications, inaccuracies, and varyin sensitivities have. oocurred. It is-, hQWfiVEILiIIQF quentlydesirableto ease, in a.- single. ohere ionr dimensionsvarying esmuches 3,0. to 50 those smiths... In, gases-mode according tothepresr exit-invention, the movable work engaging;. hehoev benor membersw-ill move this amount. but? due to the angular disposition of the nozzle. orifice. lntheeage. relative to the'surface of the work; contacting member the effective closing movement of. the surtaceon the movable work ont sting member directly toward the ozzie. nsliieee. ismuch lessthan the/redial movement t he. work engaging member; This retro. or;

movement-oi: thegegmg member tow-e d.

o zle end. lace. relative tothe radial movement-of. (wmacfing; member may be varied over a;

wide range, by ehoosms; Suitable. oblique. angles torthe. exist ieoe oi; the'nozzle and. the, opposin ehchteee. oi, the radially movable nozzle closns hdworhehsogihs member. By making the. end toes of; he home-approximat ly 84 f om heexisoficthe.boneheins' eas d, and makin the m! .faeeof the-movable easing member vemerit. of the seeing e ly ten times the efieet ve..1o. h movement of. the oblique rose 0.1 the movable. s eingm mber towarcienci from theobliqu eno ieee oi the. n zzle. It will be underst od; of. o rseu hat the planes. i h nozzle endiece amt f th Work. en a in membenwilibe parall li o' aoh other and so dis- Posed: the edie movement of the movable g ng" m er w hohm and. los h g p between. the or fice of the n zzle nd h ppo ,.f.a.ce of the work contesting member.

The-se ment mal s. elonga ore suc as hose in fire arms of me hineeun colibers, necsserily covers a r lativ ly Wi d m nsi nal, range; to gage the progressive fire, Wear of the barrei periodical-ly over the effective life of the 31111.. For that purDO Bv the present gage has been provided, in which the gage head is in the iormofo sleeve fltti-ng readily within the minimum bore to be gagect.

with the above and other objects in view, the invention may include the features of construction; and. Operation set forth in. the ol ow p c.- ifiostioh and illustrated, in the acco panyi drawing In. the aoe mpanying rawin annex d hereto and. term. g a part: of. this speoifi e ion, I. hav show-n the inventi n embodie n. w gage hea f slightly oifierent types! bo hof wh fo elongated bores either p ain. or rifl d. t i w be'uhderstood that the nvention can be o h rwiseembodeied. and that: the dr wing is no to bemonstmed esdefihihs or limi in the.v scope ottho. imzentionrthe cla ms appended to this heeifioetion.beingr li d upon rtha p rpos thedrewingz- Figure-i. is e. oeh rei ngitud na section f a-.- sage heed made ecoordine to.- tbe present. inventiomtheheaci-being shown upon an enlarged and. somewhat exas emted scale to more clear- 1y show its construction;

Fi ure 2: 18.1% transverse sectional, View taken on. the Plhllfiflf 1 .I.1"Ze=-Z.-; I.-1.' .g, l1. T 1;

Figure-:3 is-etrahsv r e s ctional View, w on theplsne of line 3 -3 oi Figure. 1;

Figure ..is, a transverse..se i helview, taken ohtheglene of line iii-40f Fi ure 1:

Figure 5 is a longitudinal fragmentary view of another form of the invention, having opposed, axially adjustable work contacting members;

Figure 6 is a fragmentary view, showing one of the work contacting members of the gage shown in Figure 5 in a different position of axial adjustment; and V Figure 7 is a transverse sectional View, taken on the plane of line 7-! of Figure 6.

In the above mentioned drawing, there have been shown but two embodiments of the invention which are now deemed preferable. to be understood, however, that changes and modifications may be made within the scope of the appended claims without departing from the spirit of the invention.

Briefly, and in its preferre daspect, the invention may include the following principal parts; first, an elongated sleeve; second, a conduit within the sleeve to which air is supplied from a suitable source at constant pressure; third, a nozzle at the inner end of the conduit, the end face of which is disposed at an oblique and steep an'gle to the axis of the sleeve; fourth, a radially mov able member mounted within the sleeve, having a work contacting portion and an end face adjacent and parallel to the nozzle end face and at an oblique angle to the axis of the sleeve; fifth, a flexible strip or strips for supporting-and permittin limited radial movement of the work con-' tacting member toward and from the nozzle, and sixth, in the modified form shown in Figures 5, 6 and 7, axial adjusting means for the flexibly mounted nozzle closing work contacting members.

Referring more in detail to the figures of the drawing and first to Figures 1 to 4, in which one preferred embodiment of the invention is shown, it will be seen that an elongated sleeve to is provided, adapted to fit readily within the gun barrel or other part W being gaged. Within one part of the sleeve It is a member 52 secured in spaced relation to the wall of'the sleeve as by screws it and to which air is admitted from a suitable source under pressure through a supply" conduit i6. Within the inner end of this member 12 may be inserted in fixed position therein, a nozzle member I8, the inner end face of which, forming the orifice for the air supply, is at a steep oblique angle approximately 80 or more to the axisof the sleeve :9. As the supply of air'to the conduit I 6 may be in every way similar to the supply of air to the conventional forms of pneumatic gages, a description is not thought necessary.

Positioned in opposed relation to the end face or orifice of the air nozzle it is the correspondingly oblique end face of a radially movable r'nember 26. This member 20, as shown in Fig. 1, is supported on parallel flexible thin metal strips 22- so that during its movement transversely of the tube, the end face adjacent the nozzle will be maintained always in accurate parallel relationto the nozzle orifice. This member as is forced laterally by one or more'springs 2 5, so that atransversely adjustable member 26 mounted on the member, may, at its outer end, always contact the surface of the part W being gaged. For this purpose, the sleeve is cut away and the adjustable member 25, when the sleeve is passed through the bore being gaged, is in constant contact with the surface being gaged. The

adjustable member 26 may be in the form of a screw threaded transversely through the radially movable member 2a and may be locked'in any desired position by means of a nut 28. To support this radially or transversely movable mem- It is 4 ber 20, the thin strips 22 are attached, as shown, to a block 30 secured at the inner end of the sleeve Iii.

Inserted in the circumferential surface of the sleeve It are bearing members 32 adjacent the radially movable member 20 and disposed at from the member 26. The sleeve iii, therefore, contacts the bore being gaged at three spaced points about the portion being gaged, the two bearing members 32 being fixed in position and the movable member 26 being resiliently pressed at all times toward the surface being gaged but free to move radially in either direction as the bore varies in diameter.

It will be seen by an inspection of Fig. 1, that due to the obliqu disposition of the orifice of nozzle 58 and the adjacent opposed oblique surface of the transversely movable member 28, the nozzle closing effect of the end face of the transversely movable member as will be much less than the radial'movement of this member. With the faces formed at the oblique angle showniin' Fig. 1, the closing effect on the nozzle openingof member at will be approximately one-tenth a limited and controlled amount'of'air admitted to the conduit 1 6 from a constant pressure source in the conventional manner, the sleeve I!) is passed through the barrel or other member- W being gaged during which the emf surface of member 2% on the flexibly mounted member 26 contacts portions of the surface being gagedand correspondingly moves slightly in a transverse or radial direction. This movement sf member it moves its oblique end face toward and from the orifice of nozzle I'B'and auqwsmore or less air to escape from the orifice. 'B'ynoting varia'- tions in the pressure within conduit 16, due to the variations in clearance between the nozzle orifice and oblique end face of member EG, or by recording these pressure differences sits-by a re.'-. corder shown in the patent "toMcor'e 2,374,154,

granted April 17 1945, the variations indiameter along the member W being gaged may-be determlned or recorded.

During operation of the gage, and with-the from the nozzle orifice is free, without building up pressure, to pass through the sleeveand tube or barrel being gaged by theopen space between the sleeve "It and member W being gaged.

- The form of invention shown in Figsf'5, 6 and 7 enables the'nozzle clearance between its orifice and the surface of the Work engaging memberopposed thereto to be adjusted over-a relatively wide distance. Work of widely different diameters may therefore be gaged by axial adjustment of the work engaging member. Particular diameters over a relatively large range may bej gagedlwith the'isame normal gap. '--By this adjustment 'of'the work cngaging member the most eminent nozzle opening can be chosen for work pieces being gaged having diameters varying between different limits. I

In this embodiment of the invention, the sleeve id is provided with two nozzle orifices 42 in di.

the supply for the gage shown in Eigs. 1 to 4 Preferably, and as shown, the T member M. has

its oppositely extended arms threaded and is retained in position in the sleeve by suitable nuts 48 threaded over their ends. The outer end surfaces of these threaded members form the orifices of the nozzles and are disposed, as shown, at an oblique angle of approximately 20 relative t axis of the sleeve.

Lying over each nozzle orifice is the corresponding oblique end surface of a work contacting member 50. This member, as shown, is elongated and flexible so that it may flex radially by engagement of its outer portion against the surface of the bore being gaged. At the opposite end of member 50, from its nozzle closing surface, it is attached as by means of screws 52 to the sleeve 40. The screws 52 pass through elongated slots 54 formed in the members 50 at their secured ends so that the member 50 may be adjusted axially of the sleeve and secured in any axial position. The effect of this axial adjustment is to vary the clearance between the orifice of nozzle 42 and the opposed inclined surface of the work contacting member 50. By adjusting the axial position of the work engaging members 50, the clearance for air escaping past the nozzle may be so adjusted that the opening may be always within the same ideal range for distances being gaged. By means of this axial adjustment, the gage may be adjusted for dimensions over a relatively wide range while maintaining the same sensitivity over the entire range.

I claim:

1. A gage head for pneumatic gages comprising a cylindrical sleeve, a nozzle therein having its front face in a plane at a steep oblique angle to the axis of the sleeve, and a work contacting member flexibly mounted for transverse movement within said sleeve, said work contacting member having its end face in a plane adjacent said. nozzle end face and parallel thereto.

2. A gage head for pneumatic gages comprising a cylindrical sleeve, a nozzle therein having its front face in a plane at a steep oblique angle to the axis of the sleeve, and a work contacting member mounted for movement to limited transverse positions parallel to each other, said work contacting member having its end face in a plane adjacent said nozzle end face and parallel thereto.

3. A gage head for pneumatic gages comprising a cylindrical sleeve, a nozzle therein having its front face in a steep oblique transverse plane relative to the axis of said sleeve, and a work contacting member flexibly mounted within said sleeve, said working contacting member having its end face adjacent said nozzle and parallel thereto.

RAYMOND S. FOX.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,099,992 Sutcliffe Nov. 23, 1937 2,374,154 Moore Apr. 17, 1945 2,490,375 Rupley Dec. 6, 1949 FOREIGN PATENTS Number Country Date 812,000 France Apr. 27, 1937 

